Verification of a Cost-Effective and Cerrobend-Free Workflow for Customized 3D-Printing Based Skin Collimation
Presentations
SU-IePD-TRACK 6-6 (Sunday, 7/25/2021) 3:00 PM - 3:30 PM [Eastern Time (GMT-4)]
Purpose: Secondary skin collimation is the optimal methodology for reducing electron scatter and preventing irradiation of non-involved tissue. However, the process of molds is cumbersome and commercial solutions are cost-prohibitive. We investigate the feasible clinical use of a 3D printed shaper filled with tungsten balls for skin collimation.
Methods: Using a 3D model a 3D printing based skin collimator (3D-SC) was produced. The thickness of the 3D-SC was set at 8 mm and filled with 2 mm tungsten balls (17.5 g/cm³). Measurements were performed with 6 MeV in solid water at 0.5 cm depth with Gafchromic™ EBT3 films. The film was irradiated with 300 MU. The irradiated film was scanned and analyzed with an OmniPro I’mRT (IBA Dosimetry). A clinical case is used to demonstrate the ease of implementation.
Results: The penumbra (90% to 20%) value measured was 0.175 mm for the 3D-SC. Compared to this, the conventional Cerrobend cut-out created 0.72 mm penumbra. The total print time of the 3D-SC was less than 5 hours. Once the CT scan was acquired, our clinical case was modeled in our 3D planning software within 30 minutes.
Conclusion: Skin collimation’s efficacy is confirmed with the 3D-SC. This process is efficient (e.g., less labor-intensive than molding), cost-effective, and the shielding (tungsten balls) is reusable. Future work will verify this methodology with additional patient cases involving large curvature and irregularity.
ePosters
Keywords
Electron Therapy, 3D, Conformal Radiotherapy
Taxonomy
TH- External Beam- Electrons: Development (new technology and techniques)
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